nctm standards: 3, 6, 8, 9, 10. 1.1 points, lines, & planes pointlineplane definition model...
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NCTM Standards: 3, 6, 8, 9, 10
1.1 Points, Lines, & PlanesPoint Line Plane
Definition
Model
Drawn
Named By:
Facts
Words/
Symbols
As a dot With an arrow at each end
A location in space, represented by a dot
A set of points that extends without end in two opposite directions
A set of points that extends in four directions without end
As a parallelogram
A capital block letter
Two points on the line or a lower-case cursive
A capital cursive letter or 3 noncollinear * points
Has no shape or size
Has immeasurable length, but no width or thickness
Has length & width, but no thickness
Point P
P
Line n, line AB, line BA
BAor AB
Plane T, plane XYZ, plane XZY, Plane YXZ, Plane YZX, etc.
* Noncollinear: three or more points not in a straight line
SOLUTION
EXAMPLE 1 Name points, lines, and planes
b. Name three points that are collinear.Name four points that are coplanar.
a. Other names for PQ are QP and line n. Other names for plane R are plane SVT and plane PTV.
a. Give two other names for PQ and for plane R.
b. Points S, P, and T lie on the same line, so they are collinear. Points S, P, T,and V lie in the same plane, so they are coplanar.
GUIDED PRACTICE for Example 1
ANSWER
Other names for ST are TS and PT. Point V is not coplanar with points Q,S and T
1. Use the diagram in Example 1. Give two other names for ST . Name a point that is not coplanar with points Q, S, and T.
EXAMPLE 3 Sketch intersections of lines and planes
a. Sketch a plane and a line that is in the plane.
b. Sketch a plane and a line that does not intersect the plane.
c. Sketch a plane and a line that intersects the plane at a point.
SOLUTION
a. b. c.
EXAMPLE 4 Sketch intersections of planes
Sketch two planes that intersect in a line.
SOLUTION
Draw: a second plane that is horizontal. Shade this plane a different color. Use dashed lines to show where one plane is hidden.
STEP 2
Draw: the line of intersection.STEP 3
Draw: a vertical plane. Shade the plane.
STEP 1
GUIDED PRACTICE for Examples 3 and 4
4. Sketch two different lines that intersect a plane at the same point.
Use the diagram at the right.
5. Name the intersection of PQ and line k.
ANSWER Point M
ANSWER
GUIDED PRACTICE
6. Name the intersection of plane A and plane B.
7. Name the intersection of line k and plane A.
ANSWER Line K
ANSWER Line K
G
H
J
K
L
M
Q
•T•U•R
Space
A boundless, three-dimensional set of all points. Space can contain lines & planes.
HW - Page 9: 2 – 44 evens
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